Double Efficiency

    The Double Efficiency was perhaps the pinnacle of engine development by Fuller & Johnson.  Two different designs were used on these engines which were introduced in 1905.  The big 8, 10, 12, 16, 18 and 20 hp engines were of sideshaft design.  3, 5, 7 and 9 hp engines used a push rod design, all had ignitor ignition.  A 4 and 6 hp, the 6 hp being an oil cooled engine with a water hopper cast into the cylinder, were available until 1906.  The DE engines were well built and very smooth running.  Because of this the cost of manufacture was high, too high for the company to stay in business. In 1912 a new series was introduced and by 1913, few DE engines were built.

Fuller & Johnson's only sideshaft engine.  Heavy construction is evident in the photo.

A 7 hp DE engine on team truck.

A combination feed grinder and wood saw on team trucks powered by a DE.

A mid size DE on factory portable.  

An 18 hp DE

The same engine running a feed grinder on a farm near Madison, WI.